You video interview not loading is most commonly related to internet connectivity, please try the following:
Check your browser version is up to date by checking in browser settings, or by using the following site: https://www.whatismybrowser.com/ (Please go through with the update if available)
Ensure there are no file transfers (downloading/uploading) occurring
Pause/close any video streams (Youtube, Netflix, etc)
Have as few windows and tabs open as possible
Use physical (ethernet) connection if possible
Update/Restart computer
Update/Restart router
Move locations for better reception for Hotspot/stronger network
Switch browser
If issues persist, please try accessing the video interview via a different device or connection (for example, mobile hotspot).